The driver failed to stop after a collision with a motorbike in Ringmer.
Police would like to speak to the driver of a Mercedes who failed to stop following a collision with a motorcyclist.
A Suzuki bike and a white Mercedes E Class collided on Moor Lane, Ringmer, at 3.07pm on Sunday, 27 August.
The rider of the bike, a 51-year-old man from Bexhill, was taken to Royal Sussex County Hospital with serious multiple injuries.
If you witnessed the collision or have any information on the Mercedes driver please report online or call 101 quoting reference 794 of 27/08.